Frontier's nonstop service to Denver — the first ever offered from Harrisburg — begins Tuesday, and its Orlando flights begin Thursday, said Scott Miller, airport deputy marketing and public relations director. The airline announced the routes in February.

Orlando is the airport's No. 1 destination, and Denver has always been in the Top 10, Miller said. In addition to being an appealing city for tourism and business in its own right, Denver provides air connection to West Coast cities including Los Angeles, San Diego and Seattle, he said.

Frontier is offering the Denver service on a seasonal trial basis through Labor Day, Miller said. If it goes well, the airport hopes Frontier will expand it next year, he said.